Some one tryed this?
I've build it.. PSU is a SMPS at +20@8,5A enough i think..
BUt when i connect the power amp the car stereo turn off and nevere turn on again once i disconnect the power amp...
I've thought that maybe the smps but without the power amp it's all ok.. And this happen when i connet the positive and gnd to power amp.. If i connect only the negative and gnd the stereo remain on but without any sound...
What's maybe wrong?

Originally posted by MaXiZ Some one tryed this?
I've build it.. PSU is a SMPS at +20@8,5A enough i think..
BUt when i connect the power amp the car stereo turn off and nevere turn on again once i disconnect the power amp...
I've thought that maybe the smps but without the power amp it's all ok.. And this happen when i connet the positive and gnd to power amp.. If i connect only the negative and gnd the stereo remain on but without any sound...
What's maybe wrong?

On the amp SCH it sais +/-V. Are you using single voltage supply (0/+20V). If that's the case you really need a output cap. I don't think I understand well your setup.

sorry!
I use ONE car battery that is directly connected to a car stereo, the SMPS is connected to it and give +/-20@8.5A with 4.400uF per rail.
At the moment for a test i would use this setup..
Car stereo=>Power Amp (tda1514)=>Speaker

Originally posted by MaXiZ sorry!
I use ONE car battery that is directly connected to a car stereo, the SMPS is connected to it and give +/-20@8.5A with 4.400uF per rail.
At the moment for a test i would use this setup..
Car stereo=>Power Amp (tda1514)=>Speaker

Just finished drawing that. and then I red your answer. So forget about my crappy art.

It is a gnd problem I think. Is the GND (-) of the battery connected to the gnd of the SMPS power supplay, or they have no internal connection?

The IC pack is connected internaly to -V. Where did you mount the IC. Is it mounted on heatsink touching the gnd. I suspect something to do with that (since I cant see the actual setup).

and i've noticed another thing...
i've made a test to see if there's a gnd problem as u say..
If IC is connected seems like + & - are directly connected, instead without it like there's a 2000K resistor...
Contact me privatly too.. if u can..
icq:47573544
mail:maxiz@inwind.it